无法显示选项卡式JTable的表头

Question

我有一个JTabbedPane,其选项卡中包含三个表.的JTabbedPane,再次,是在JScrollPane.我想{"Client", "Action", "Location", "Value"}为每个表显示一个修复表头,它遵循模式.当我试图设置标题时ActionListener(见下文),我可以自由地使用其他方法(例如,最初设置标题).

其他SO帖子也解决了同样的问题,但我无法显示表头.唯一有效的方法是在上述表格中添加数据ActionListener.我不明白为什么标题没有显示,因为我将数据以String-matrix的形式与String表示标题的-array一起传递.

首先,这里是关于我的表的代码片段,它在GUI启动时执行(my initialize()-method).

    tabbedPane = new JTabbedPane(JTabbedPane.TOP);
    tabbedPane.setBorder(new SoftBevelBorder(BevelBorder.LOWERED, null, null, null, null));
    tabbedPane.setFont(new Font("Carlito", Font.PLAIN, 13));
    tabbedPane.setBackground(Color.WHITE);
    tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

    tableBefore = new JTable();
    tabbedPane.addTab(descrTableBefore, null, tableBefore, null);
    tableBefore.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableBefore.setFocusable(false);

    tableMainTest = new JTable();
    tabbedPane.addTab(descrTableMain, null, tableMainTest, null);
    tabbedPane.setEnabledAt(1, true);
    tableMainTest.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableMainTest.setFocusable(false);

    tableAfter = new JTable();
    tabbedPane.addTab(descrTableAfter, null, tableAfter, null);
    tableAfter.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableAfter.setFocusable(false);

    scrollTables = new JScrollPane();
    scrollTables.setBounds(442, 11, 397, 490);
    scrollTables.setViewportView(tabbedPane);
    frmTestframework.getContentPane().add(scrollTables);

下面再次是一个代码片段,但这一次来自上面提到的ActionListener,它被添加到一个按钮,将元素添加到JTable.目前我正试图让它只使用一个表:tableMainTest.这就是我尝试定义表头的方式:

    dataMatrixMain = new String[itemListMain.size()][];

    for(int j = 0; j < itemListMain.size(); j++)
        dataMatrixMain[j] = itemListMain.get(j);

    modelMain = new DefaultTableModel(dataMatrixMain, header);

    mainGUI.tableMainTest.setModel(modelMain);

• header是一个String形式的阵列{"Client", "Action", "Location", "Value"}
• itemListMain 是一个字符串数组列表
• dataMatrixMain是String用于用数据填充表格的矩阵

有谁知道,必须更改什么才能使标题可见？

编辑:

程序启动后,用户将看到我的表处于以下状态:

用户只需看到三个选项卡,哪些表都是空的.

用内容填充表是用户的工作.从a中选择元素JList并提交后,表格将按以下方式填充:

每次从中提交所选元素后JList,它将直接显示在JTable.我这样做是通过设置DefaultTableModel的JTable.因此显示输入的元素就像预期的那样.只有标题不会显示在条目的上方.

编辑2:SSCCE

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.border.BevelBorder;
import javax.swing.border.SoftBevelBorder;
import javax.swing.table.DefaultTableModel;


public class GUIMain{

    private JFrame frmKeyoperateTestframework;

    public JTable tableBefore;
    public JTable tableMainTest;
    public JTable tableAfter;

    public JTabbedPane tabbedPane;
    public JScrollPane scrollTables;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    GUIMain window = new GUIMain();
                    window.frmKeyoperateTestframework.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public GUIMain() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {

    frmKeyoperateTestframework = new JFrame();
    frmKeyoperateTestframework.setResizable(false);
    frmKeyoperateTestframework.getContentPane().setBackground(Color.WHITE);
    frmKeyoperateTestframework.setFont(new Font("Carlito", Font.PLAIN, 14));
    frmKeyoperateTestframework.setTitle("GUI");
    frmKeyoperateTestframework.setBounds(100, 100, 865, 584);
    frmKeyoperateTestframework.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frmKeyoperateTestframework.getContentPane().setLayout(null);

    tabbedPane = new JTabbedPane(JTabbedPane.TOP);
    tabbedPane.setBorder(new SoftBevelBorder(BevelBorder.LOWERED, null, null, null, null));
    tabbedPane.setFont(new Font("Carlito", Font.PLAIN, 13));
    tabbedPane.setBackground(Color.WHITE);
    tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

    scrollTables = new JScrollPane();
    scrollTables.setBounds(446, 50, 397, 490);
    scrollTables.setViewportView(tabbedPane);
    frmKeyoperateTestframework.getContentPane().add(scrollTables);

    // "5" to show, that only data rows are displayed
    DefaultTableModel tableModel = new DefaultTableModel(new String[]{"Client", "Action", "Location", "Value"}, 5); 

    tableBefore = new JTable();
    tableBefore.setName("tableBefore");
    tableBefore.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    tableBefore.setModel(tableModel);
    tabbedPane.addTab("Before", null, tableBefore, null);
    tableBefore.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableBefore.setFocusable(false);

    tableMainTest = new JTable();
    tableMainTest.setName("tableMainTest");
    tableMainTest.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    tableMainTest.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableMainTest.setFocusable(false);
    tableMainTest.setModel(tableModel);
    tabbedPane.addTab("Main", null, tableMainTest, null);
    tabbedPane.setEnabledAt(1, true);

    tableAfter = new JTable();
    tableAfter.setName("tableAfter");
    tableAfter.setModel(tableModel);
    tableAfter.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    tabbedPane.addTab("After", null, tableAfter, null);
    tableAfter.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableAfter.setFocusable(false);

    tabbedPane.setSelectedComponent(tableMainTest);
}
}

Answer 1

我自己找到了解决方案.解决方案只是JScrollPane 为每个表使用a ,其中包含了JTabbedPane.之前,整个JTabbedPane被包裹在一起JScrollPane.现在,每个标签都包含一个JScrollPane而不是一个JTable.虽然删除旧JScrollPane表并将表打包成自己的表听起来很简单,但需要花费一些精力来更改剩余的代码,修复它,并使新代码适合GUI的布局.

我找到了一个很好的代码示例,它应该如何显示在这里.

您可以在下面找到一个代码示例,说明a JTabbedPane,a JScrollPane和JTableshas 的组合如何工作:

    tabbedPane = new JTabbedPane(JTabbedPane.TOP);
    tabbedPane.setBounds(446, 50, 397, 490);
    tabbedPane.setBorder(new SoftBevelBorder(BevelBorder.LOWERED, null, null, null, null));
    tabbedPane.setFont(new Font("Carlito", Font.PLAIN, 13));
    tabbedPane.setBackground(Color.WHITE);
    frame.getContentPane().add(tabbedPane);  // JFrame

    tableMainTest = new JTable();
    tableMainTest.setName("tableMainTest");
    tableMainTest.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    tableMainTest.setFont(new Font("Carlito", Font.PLAIN, 13));
    tableMainTest.setFocusable(false);
    tableMainTest.setModel(tableModel);

    tableMainTest.setPreferredScrollableViewportSize(tableMainTest.getPreferredSize());
    tableMainTest.changeSelection(0, 0, false, false);
    tableMainTest.setAutoCreateRowSorter(true);

    JScrollPane scrollMain = new JScrollPane(tableMainTest);
    scrollMain.add(tableMainTest.getTableHeader());
    scrollMain.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER );
    scrollMain.setBounds(446, 50, 397, 490);

    tabbedPane.addTab(descrTableMain, scrollMain);